Differential diagnosis of fatigue are :
-cancer
-congestive heart failure
-chronic renal failure
-chronic obstructive pulmonary disease
-diabetes mellitus
-alcoholism
-hypercalcemia
-hepatitis
-endocarditis
-HIV
-tuberculosis
-lyme disease
-insufficient sleep
-sleep apnea
-depression
-anemia
-hypothyrodism
-beta blockers
-sedatives
-somatoform disorders / somatization
-mononucleosis
-fibromyalgia
-adrenal insufficiency
-autoimmune disease
-iron deficiency anemia
-cancer
-congestive heart failure
-chronic renal failure
-chronic obstructive pulmonary disease
-diabetes mellitus
-alcoholism
-hypercalcemia
-hepatitis
-endocarditis
-HIV
-tuberculosis
-lyme disease
-insufficient sleep
-sleep apnea
-depression
-anemia
-hypothyrodism
-beta blockers
-sedatives
-somatoform disorders / somatization
-mononucleosis
-fibromyalgia
-adrenal insufficiency
-autoimmune disease
-iron deficiency anemia